How to confige the power 3.3v avdd and 1.8 v dvdd at the x20 platform

Hi all
I need a help, I am porting a new touch to MTK X20,but not know how to config the power 3.3v 、1.8v and where I can connect these two interface. I already use i2c4 and eint5 as interrupt for communicat6ion .But not know how to config the power, anyone have the document?

actually I do not really know how to config the gpio,

You have 1.8 v pins gpios. You can use Mos as switches to configure 3.3 v.

:thinking: It is all given in hardware manual. Find it And you might need sachamatic which you can find at